# Copyright 2020 The SQLFlow Authors. All rights reserved.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import types

import tensorflow as tf

__all__ = [
    'is_tf_estimator',
]


def is_tf_estimator(model):
    if isinstance(model, types.FunctionType):
        return False
    else:
        return issubclass(
            model,
            (tf.estimator.Estimator, tf.estimator.BoostedTreesClassifier,
             tf.estimator.BoostedTreesRegressor))
